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APPLICATION FILED APR.24,1919.

1,407,727, Patented Feb. 28, 1922.

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LAST LATHE. APPLICATION mm man. 1919.

Patented Feb. 28, 1922.

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Patented Feb. 28, 1922.

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Patented Feb. 28, 1922.

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APPLICATION FILED APR24I I919.

Patented Feb. 28, 1922.

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LAST LATHE.

APPLICAHON FILED APR,24.19!9.

Patented Feb. 28, 1922.

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F. S. BUCK.

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APPLICATION FILED APR.24 I919.

Patented Feb. 28, 1922.

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APPLICATION FILED APR.24. 19w.

1 ,407,727, Patented Feb. 28, 1922.

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LAST LATHE.

APPLICATION FILED APR. 24. 1919.

Patented Feb. 28, 1922.

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F. S. BUCK- LAST LATHE- APPLICATION FILED APR-24, m9. 1 ,407,727, Patented Feb. 28, 1922.

12 5HEETSSHEET l2- Illlllllll IIIIHIIIIHH III] If. ummm UNITED STATES PATENT OFFICE.

FRANK S. BUCK, OF SPRINGFIELD, VERMONT, ASSIGNOR TO FITZ-EMPI Rn DOUBLE PIVOT LAST COMPANY, OF AUBURN, MAINE. A CORPORATION OF LAST LA'ri'm.

Specification of Letters Patent.

Patented Feb. 28, 1922.

T 0 all m 1mm '2 It may oomrc im:

Be it known that I, FRANK S. BUCK, a ritizen oi the United States, residing at Spring'lieid, in the ronnty oi Windsor and State of Vermont, have invented eertain iniproi'einents in Last Lathes, of which the following description, in ronneetion with the aeoonipanying drawings, is a speoiiiration, lilie FOTGIOHC'B l'dltl-i'ZlCt-UTS on the drawings indicating like parts in the several figures.

This invention relates to maehines for produring artieles having a systematic reseinhlnnee to a pattern and is herein disclosed as embodied in a last lathe. It should be understood, however, that the invention, esperially in some aspeets is not limited to this partieuiar type of eopying nuwhines, or indeed, to iuarhinrs For producing solid ohjerts.

Prior to the (lOVt-SlUlHllLllll ol inarhines enihodyiug; the present invention, shoe lasts have been rut in last lathes having a swinging frame with provision for cutting one last at a time. it had long: been recognized that a maehine whirh would rut two lasts at onre. would out down by nearly the floor spare. and time neizessary to produce a given output of lasts, and marhiues :lor rutting two or even more lasts at onre have been proposed, but until the machines oi the present invention were developed, none had ever been even practically developed, because none oi the proposed Forms gave suitioient promise oi sernring the meticulous 21C- euraey required in eoniinereial last (rut-ting. For example, last whieh is inacrurate by as nnu-h as llli'll in a dimension is rejerted and any substantial number of errors as large, as 3 1; inch will cause the rejection of a whole order ol last-s.

M n-h ot' the inarruraey oeenrring in last rulting: is due, among! other rauses. to vibration and iar. and to liltli of slili'ness in the parts The movement of the oscillating Frame which rarries the model and hlori; is giii'erned b the model wheel. the pressure i'roin whirh has to stop and reverse the dire. Lion ol' the llll i tillPilt ezirli time lhe model and hlorlis revolve. This l ars; the n'mrhine and rauses the illilils in run inarrurately in the l=lorl in larlc ol' till'nesH in the swing frame will also rause illilttlllilte cutting. The mailing? of the port: abundantly L i'ii'l' to eliminate diiiiruity Lill to distortion of the speed surh an or gani /iationispritetieally in];

possible to lialziinee dynamically, because among other eharaeteristies, it' is not symmetrical with regard to any axis, the different roughing riitters and the finishing ei'it te i s being of different and shapes. Such a construction in itself v'es rise to innoh vihration. p

The problem oi the double lathe seeihs at first sight a simple one, and mai 'y soln tions have been .-;ii g'ested, none of wl ieli; however, has proiiin sed sullieient practical possibilities to warrant embodiment in an actual machine. 7

My invention, above mentioned, pointed the m to a solution. By it I am enabled to redure the' diziineter of the cutter head from ten' inches to three ahdone-hali? inches o'reven While this reduction iiL siz'e' was made originnlly to insure alurate redupiit ationot' a n'iodl having sharp conceivities which was one of the main objects oflthe invention of the patent referred to, I was later also led, to in 'estigate' the queStion Whether the reduction in size might not' be an iniporta'nt factor in pern' ittint construction of a machine which would handle a m'odel and two blocks without inrreiising the size and mass oi' the moving parts to such a degree as to eause prohibitive sluggishness and The use of two entter heads rather than one is neressary in order to prodnre the proper reaction between the rntter and the block. it hag been proposed to out a right and left last sinniltaneously with a single rntter head of the old ten-inrli type. This gives rise to the diliieulty that the line of shear between the rutlrr and the l1l()(l\' is not perpendicular to the line ol relative movement of the cutter and blork so that the rutter tend to pull one lilL-(li into iteell'p To those skilled in the art it is well known that it is not good prartiee The old cutter head was several] to feed work in the direction ofcut because the jerk and hogging of the cutter makes the work imperfect and gives rise to vibration and consequent rough performance everywhere in the machine. I have found that two cutter heads are necessary in order to avoid this difliculty, and have been able to get the moving parts into compact form and thus avoid weight and secure stiffness by the application of my invention above noted, to the problem. This novel combination is an important feature of my invention.

It is necessary when a left last is to be cut from a right model that the bloclr and model approach the cutter and model wheel, respectively, in a straight line. Any de parture from this produces a twist in the work and the twist is in the same direction in both the right and left lasts which will therefore fail to be accurate reflections by double the amount of the twist. I have therefore advantageously combined a rectilinearly sliding frame with the double cutter head construction, the direction of slide being preferably parallel to the planes con taining the respective blocks and cutters.

My invention also comprises a novel length grading mechanism which is an improvement upon that shown in my Patent No. 1,302,803, granted Apr. 29, 1919. The invention of this patent secured mathematical accuracy of grading by means of a rectilinear sliding action. I had embodied the invention first in a boot tree lathe in which it gave entire satisfaction. I found, however, when I came to cut lasts with it, that the reaction between the cutter and model wheel and the steeply sloping surfaces of the block and model caused a certain amount of longitudinal jerk in the movements of the carriage due to an unavoidable slight amount of backlash in the slide, which was approximately parallel to the direction of movement of the carriages and that the work would fail'to grade properly over the interval covered by the jerks, this interval being several times the amount of the looseness, where a small grade was being made. I found also, in using the mechanism of the patent when a very slow grade was being made on a block having room only for a very short front stub, that any great amount of back lash in the slide might fail to be taken up before the toe tip was reached. The present invention removes even the possibility of these difficulties by providing what is in effect a wedge in the connecting means between the cutter and model wheel carriages. Preferably I arrange this wedge so that its line of travel is transverse to that of the carriages so that any backlash in its slide must be taken up before the carriages have traveled more than .01 inch. The rectilinear sliding wedge faces secure the advantage of mathematically perfect grade obtained by the prior invention, and avoid the development of any possible difficulty due to wear and looseness of the parts.

These and other features of the invention, comprising various combinations and arrangements of parts will be understood from the following description of two embodiments of the invention, selected for purposes of illustration and shown in the appended drawings, in which Fig. 1 is a front elevation of the essential parts of the machine;

Figs. 2 and 3 are end elevations; Fig. 4 is an end elevation of the slide frame;

Fig. 5 is a detail of the drive mechanism; Fig. 5 is a plan of the mechanism shown in Fig. 5;

Fig. 6 is a perspective view of the carria es;

*ig. 7 is a detail of the grading mechanism;

Fig. 8 is a complete detail showing the grading mechanism;

Fig. 9 is a detail of the drive mechanism; Fig. 10 is a perspective of another machine;

Fig. 11 is an end elevation; Fig. 12 is a front elevation of the slide frame;

Fig. 13 is a side elevation of the slide frame Figs. 14 and 15 are details of the roller bearings; and

Figs. 16, 17 and l8 are details of the grad ing mechanism.

The main frame 10 is provided at its top with two guides which are parallel and extend and slope downwardly from front to rear. These guides each comprise two sets of vertically acting roller bearings 14 and two laterally acting roller bearings 16, one set of each near each end of the guide. These bearings co-act with ribs 18 on the lower frame members of the slide frame, which will now be described. The relation between the main frame and the slide frame may be otherwise contrived, but the form shown is a good practical one.

The slide frame is formed of two bars 20 which carry the ribs 18. hlounted on the bars are the verticals 22, which are braced to the bars 20 by diagonals 24. The momhers 20, 22, and 24 comprising each end frame of the slide frame are preferably cast in one piece. These end frames are joined by two bars 26 near the top and bot tom, respectively. The left hand member 22 is shown with an extension 28 carrying a roller 30 which runs in a guide 32 at the upper end of an arm 34 which is firmly fastened to the main frame. The guide 32 is l, i lateral so that it supports the slide frame against distortion in the plane of the bars Suitable dust guards, preferably of felt,

- slide downwardl towardkthe' rear of the machine. It is hel inits'extremeforward 'position, when desired, for the purpose of ciampingthe work, for example, by a suitable latch 3%, Pi 1 and 2 operated lay a handle 40. A ro'c haft 42, Figs. 5 and 9' is mounted in the main frame and carries two crankarms 44 extending upwardlfy t'o Ward the slide frame. The upper ends of these crank arms are linked by links 46 Figs. 2 and 3 to the bars. 20, respectively. The slide frame is thus preserved against distortion in the'pla'ne' of the bars 20. The shaft 42'has a thirdcrank arm 48 which carries a counterweight 50. This arm carrbe arranged either before or behind the shaft 42, as indicated by' f-ull' and dottedli'nes Fig; 2, sothat the'counterwei'ght Willtend to impel the slide frame either u ;or down the inclined waylZ as desired. Iii the referred construction the incline is. such: that the downward tendency of the slide frame under the influence of gravity Will produce the maximum res snre required between the model Wheel and" model, in orderthat the counterweight may be eliminated. The elimination, or. at least, the diminution of the counterweight, diminishes by so much the mass which has to be suddenly reversed in movement upon each.

revolution during the cutting, and obviates to that extent thejar'on themachine. This reversal of movement is produced by the action of the model Wheel. on the model at a heavy meshanical disadvantage, and much of the roughness in last cutting results from the vibration thus produced. The adjust able arm and" counterweight permit the modification of the gravitational effect in any;desired manner.

Mbuntedon the bars 26 are the head stock frames 52, 54, and the adjustable tail stock frames 56,58. A shaft 60 extends Between the frames 52 and 54, and has gears 62, 64. At its inner end is mounted near its ends. V the block driving dog 66".- A stub shaft 68' is mounted in the frame 54 below the shaft.

This carries agear 70 meshing'with the gear 64, and a second block dii'ving dog: 72. The frame 58 carries two correspondmg block dead centers 74 of ordinary construction; The frame 52 carries a stub shaft 7G,.on which are mounted the gear "78 meshing with the gear 62, and the model driving dog 80. The frame 56 carries the model dead center 82 of ordinaryconstruction. and blocks are driven by a gear 84, Fig. 4, which meshes with the gear 62 and is mounted on a stub shaft 86 mounted in the frame 22, and carrying a sprocket 88 on its outcr end. The gears 62, T8, 64. T0 are all of the same size, so that actuation of the sprocket The model 7 88 will drive the model and lower blocli in one direction and the up'ner block in the other direction at the same speed.

The driving mechanism will now be de' scribed. A motor 90; F i 2, is directly connected to a change iiox'92 which transmits motion to a-shafl: 94, Fig. 0, cbnnectedby a conefriction clutch 96 with a shaft 98. The cone clutch may be adjusted by thennts 100, Working against the spring 102. The shaft- 98 carries fixedly mounted thereon the toothed clutch member 104 which rec-operates with a second toothed clutch member 106 normally held in engagement with the clutch member 104 by a spring 1 08 and splined on a shaft 107 coaxial with theshaft 08. The shaft 98 carries a ear 110 which drives a gear112- on a she 114, Fig. 5, which carface. A slide 120, Fig. 5 in a bracket 121 carries a stud 122 on which is'm'oiihted a lever 124 having a fork 126'at one end to cont'rol the splined clutch member 106, Fig. 9,

and a cam roller128 at the other: The partsare so pro ortioned that the disk 116 normally revoii es Without engagement between the cam 118 and roller 128, but if the slide 120 is moved in one direction or away from the reader in Fig; 5, andheld'there, the cam- 118 will move the lever 124 and disconnect the members 104 and 106 whereupon the shaft 107 willstop.

Theshaft 42, Figs: 5 and 9, has a fourth crank arm'130 the ends of which, during the last cutting, works in an arcuate slot 132 in a bar 184 the forward end of which is pivoted to one end of a bell crank lever 136 pivoted on'the' bracket 121, the otherarm'of which is pivotedon' the slide 120. \Vhen the slide frame is pulled out to latching position,

the shaft 42is-rotated, carrying the arm 130 back against the adjustable step 138 in the sl0t'132, Fig; 5, and pulls'b'ack the bar 134. This operates the bellcrank and thrower-he slide 120, so that the shaft 107 will stop When-the earn 118 reaches the roll 128.

The shaft'lO'T, Figs 3' and 9; has at its outer end a sprocket wheel 140, around which and sprocket wheel 14.2 and the sprooketwh'ee-l 88 runsa chain 144. hepttaut by a tightene'r 146. The gearing is so pr'oportioned that theshaft 107 rotates an integra'l nu'mbec of til'ncswhile the gear 78 rotates once, so that the model and Work driving dogs will always be stopped in the same position, which will facilitate the insertion and removal of the model and blocks.

The cutter carriage 148. Fig. 6, is formed with V and flat guides150 and 152 arranged to engage a rib and a flat on the main frame. as is usual in machines of this class. The carriage has on its upper surface a dovetail guide 154 and a flat guide 156. The model wheel carriage 158 slides on the guide 156 and has an extension 160 which runs in the guide 154:. The width grading mechanism, comprising the fan board 162, vertically ad justable feeler 164, and slide 166 is oi ordinary construction. i

The cutter carriage has onits lower face a rack 1.68 driven by gearing 170,172. The worm wheel 172 is driven by theworm 174 on a shaft 176 having a cone pulley 178 driven from a cone pulley 180 on the shaft 94. The shaft 176 is raised and lowered in i the ordinary manner to engage and disengage the worm 174 and worm wheel 172, and is automatically dropped when the cutter carriage has moved to its leftmost extremity of movement. This mechanism is wellknown to users of the Gihnan. lathes and need not he further described. The handle 182 is used to run the cutter carriage back and forth rapidly when the gearing 172, 174 is disconnected.

The cutter carriage carries a dovetail 18-1 Fig. 6 on which works a slide 180. Pivoted on this slide is a block 187, which can be angularly adjusted about the/pivot by the bolts and segmental slots 188. 187 has a dovetail guide 190 in which works a grade bar 192. The block 186 is joined to the model wheel carriage by alinlt 194.

Fixedly mounted onthe cutter carriage is a dovetail guide 196 Figs. land? in'which works a vertical bar 198 carrying two arms 200 and 20:2 extending toward the grade bar. The arm 200 is pivoted to the grade bar at 201 and the arm 202 has anarcuate slot-206 about 20l as center in which the lower end of the grade bar can beadjustably secured by a clamp 207, Fig. 7. The arm 20% carries a scale 208 the reading edge of which is parallel to the bar 198 and is collinear with the center 2021. Thescale 208 is arranged to carry an adjustable-slide 210 which carries a scale 212 .at an angle of 45 with the scale 2-08 and with its zero point always on the reading edge of the scale 208 whatever its adjusted position. The grade bar 192 carries a blade 214 Whose reading edge is parallel to the grade bar and is collinear with the center 20 1.

A horizontal rack 216, Fig. 1. is mounted on the main frame, and a second rack 218 is mounted on the vertical bar 198. A pinion 2 0, mounted on the guide 196 connects these two racks. As the cutter carriage is driven to the left as seen in Fig. 1, the bar 198 will he lowered vertically at the same velocity, while being carried horizontally by the carriage. It the grade bar 192. has been set in non-parallelism with the vertical bar the vertical movement oi the system will cause the slide 180 to move relatively toward or l'roin the guide 196 by an amount equal to the product of the travel of the bar 198 and the tangent of the angle of adjustment of the grade bar measured from the mean position of: the reading edge of the scale 208.

The block This relative movement of the slide and the guide 196 will, through the link 194, move the model wheel carriage on the cutter carriage by the same amount, and thereby accomplish a length grading action on the last being cut. The relative travel of the two carriages per inch travel of the cutter carriage is equal to the ofiset or departure of the grade bar from its mean position per inch measured along the mean position.

The grading mechanism may be otherwise contrived, and another form will be described, but the form shown is strong, practical and smoothly working, and has performed satisfactorily in practice. guide 196 were mounted on the model wheel carriage the offset of the grade bar per inch would equal the relative'travel of the carriages per inch travel of the model wheel carriage. The system 198, 192, 200, 202 is a rigid one, when once adjusted, and acts as a wed e between the two carria es, the term we go being used herein in t ie sense of two relatively inclined planes used either to separate or to bring together the objects engaging them respectively. It is. obvious that the grading action will be absolutely uniform. The fact that the wedge forms part of the connection between the carriages and moves transversely to their line of travel enables all lost motion in the connections to be taken up in the first 0.01 inch of cutting, so that any irregularity due to mechanical imperfections of adjustment will disappear while the stub'at the end of the last is being out, andzthe last itself will be graded p'er-' fcctly.

An important feature of the machine, not, however, my invention, resides in the mechanism for setting the grade bar. The absolute amount byivhich any grading device is to be set depends upon the absolute size of the model used, since the grading of (for instance) 1]; inch in length per size requires different magnification ratios corresponding to different model lengths. man and in the Kimball Bros. & Spraguc lathes the length of the grading lever is changed by moving its pivot vertically, so that the same rading scale can be used for models of different lengths. The adjustments are dillicult to make, and more or less jockeying is always necessary when a new model is placed in the machine. All such difficulties have been avoided by the novel setting mechanism provided in this machine.

The scale 208 is graduated in units of size measurement according to the ordinary system in use in this country. but is calibrated in units 1.} times as lar c. That is, thcdistance bct ween the 0 and 6 marks. for evample, is inch instead of inch. The scale 212 is graduated in units of ordinary length grade, up and down, and is calibrated in {i /2 inches. The scale 208 is so located vertically If the In the old Gilthat the distances from the pivot 204 to its graduation marks are all 1% times the actual or stick lengths of the lasts corresponding to the graduations. That is, the #4 childs last is 5.271 inches long and the distance from the pivot 204 to the corresponding graduation mark is 7.906 inches. Any other multiplier K greater than 1, would do, provided only that the apparatus is large enough to permit satisfactory operation. In other words, it is the angle and not the length of the wedge which effects the desire result.

Suppose it is desired to grade down 4-}; sizesfromanSmens model. SeeFig. The scale 212 is moved so that its zero mark coincides with the 8 niens mark on scale 208 and the bar 192 is swung to the right so that the reading edge of the plate 214is over the 4% mark on scale 212. Now this 4. mark exactly horizontally opposite the mark on scale 208 owing tothe factor used in the graduation of scale 212, and the 45 angle on which it is set. Furthermore, this 43; mark is ofi'set to the left of the 3%; mark by exactly 2.25 inches. or 4% sizes as measured on the scale 208, owing to the same reasons. Therefore. while the cutter carriage (and the wedge system, vertically) travels the length of a #Sl; (i. e. of the distance from the point 204 to the 31} mark of scale 208) the model wheel carriage will be relatively pulled forward by an amount equal to of the distance between the 4% mark on scale 212 and the 3% mark on scale 208. or 1.5 inch. In other words. the model wheel carriage will travel the length of an 8 while the cutter carriage travels the length of a 3-9 which is the result desired.

It should be understood that tl le above discussion refers to lasts having the actual lengths shown on the regular last stick. If the last is of a pointed toe style, the measurement of the last on the stick Will be actually longer than its marked length. This is why an 8 mens model" was selected for illustration. This #8 model would be marked #7. which is the mens model size. and would have the size 7 foot room in it. but its pointed toe would extend it inch. and all lasts of the set. would stick one size longer than their marked lengths.

Thus the single graduation scale suffices to set the gradebar for any model. Its setting to the model length is simple, and as no stress comes upon it, no bolts have to be loosened and tightened. The setting of the scale 212 can be read b v putting the model on the last measuring stick. If the vertical movement of the wedge were governed by the model wheel carriage, the scale 212 would be at right angles to the scale 208 and the /:3' factor would be omitted in its calibration. Its adjustment and use would he the same.

The axis of theguide bar passes through the pivot between the block 187 and the slide 186. The automatic stop mechanism is preferably arranged to bring the pivot 204 in line with this pivot at the instant of stop. The grade bar can then be swung to a new adjusted position without moving the slide 184, whereas i adjustment be made when the two pivots are vertically separated, the angular movement of the bar will cause a movement of the slide 186, and consequently the model carriage.

Ti 0 cutter carriage carries a frame 222 in which are mounted the stators of two mo.- tors Suitable provision is made for relative horizontal and angular adjustment" of their axes, as for example. by the screws 226, 928. The axes of the stat Qrslie in planes parallel to the planeof the guidesl and passing through the axes of teblock holding means, and, are placed a "an aiigleof a 5011i 30"with these axes respectivelyi l he motor rotors have'fsma ll cutter heads 23p, 2K2. otfappro ximately 31} inches diameter. The relation of'the butter to the bloclg s is inaccorda ce wi h the principles set forth In lll r w en is vertically a n eib y" aimed on a slide 236 which isadjustable" in the slide 166. Its axis is similarly situated with relation to the axis of the model holding means. it has been found adva iita eoiis'to run the motors on 120 Qrde curr e'ii. ivliic can be obtained throu h a frequency changer obtainable from the eneral Electric campanv and the rotorswill then revolve it about T1200 R. l. M. The direct motor drive elimiuat es 511 vibration due to helt trouble. The double cutter construction is an enceediugjjl important feature of the invention. Each cutter is so located that its point of contact with the block ,is in t e plane of inovcmeut of the block axis, as the slide J 1 v .v ira ne moves backand forth. This insures that the lirection of cut is perpendiciilar to this plane and all tendency todrag thewgrk into the cutter with its consequent digging and \iipration, which would give rise to" serious itiicult; if it were attempted to use a single cutter between the blocks, is avoide These cutter heads revolve oppositely to the blocks they respectively engage. tional feed of the blocks is theretore likewise opposite the direction of cut, ,so that any ibration e to backlash in the gearsis avoided. This feature, iowever, is not my invention. i l

The practical success of the machine is also due largely to the compactness secured by the small cutter head construction. In the machine just described. the distance between block centersis about compactness reduces the weight of the oscillating parts, with the conse uente i tionof the vibration and jar no to the (1611i reversal of m me t e ahrgs .99 re eiit in). 113711;. The medal 1 15 The jrota- 1725 7%; inches. This The distance mentioned is as close as two rough last blocks can be conveniently hung to rotate past each other and permit the necessary handling. It would of course be impossible to work two of the old ten-inch cutters nearly so close together.

Figs. 1(l18 illustrate another form of machine embodying features of the present invention. The main frame 300 carries the side arms 302, in which are the guides 304 for the slide frame. These guides comprise a set of vertical and horizontal roller bearings on each end of each side of the swing frame. such as, for example, those illustrated in Figs, 13 and 14, where the rollers 306 are shown as co-operating with a rib 310 mounted on or secured to the slide frame 308. The slide frame- 308 comprises two end plates 312 and 313 preferably cast in one piece, and comprising a vertical member 314. horizontal member 316 (carrying the rib 310). and diagonal braces 318. The horizontal member 316 is mounted between the ends of the vertical 314. The verticals 312 and 313 are oine'd by bars 320, Fig. 12, which are joined by a third vertical 322. This is jointed to the right hand vertical 313 by intermediate horizontals 324. Diagonal braces 32:) are inserted to stiffen the frame. Three adjustable drive centers 326 are mounted in the three panels thus formed, as will be well understood from Figs. 11 and 12. The block drive spindles 328 and the model drive spin dle 330 are mounted in the verticals 322 and 312, and driven by the gears 332, 334, 336. respectively. Two intermediate gears 338 are provided so that all three spindles can be driven in the same direction, or either or both of the block spindles can be driven oppositely to the spindle 330, by properly shifting the gears- The gear system is driven by a pinion 340 on a shaft 342, Figs. 11 and 13, on the outer end of which is a pulley 344 driven by a belt 346 which passes over idlers 348, 350 and the drive pulley 352. con nected with the main drive pulley 354 by the belt 356. pulley 358. shaft 360. pulley 362. belt 364. pulley 366. shaft 368. pulley 370. belt 372, pulley 374 and shaft as will be understood from Fig. 10.

The cutter carriage 3T8 slides on ways 3 9.

381 on the main frame 300. and is driven in the ordinary manner by the pulleys 358. 380. 384. and the ordinary gearing 386. as is amiliar to all skilled in this art. The model wheel carriage 38 slides upon it as in the previously described machine. is dovetailed into it at 390, and carries a plate 392 extending out at the back of the machine. It also carries a bracket and pinion 394. and a slideway 396 in which moves vertically the slide bar 398. on which is a rack 400, co-operating with the pinion 394. The bar 398 has an arm 402 to which is pivoted the grade bar 404 dovetailed into a block 406 which is pivoted at 408, and clamped by the slot 410 and bolt 412, to a slide 414 dovetailed to the cutter carriage at 416. The upper end of the grade bar is connected to the bar 398 by a slotted link 418. The block 406 is connected to the plate 392 by the adjustable link 420. The setting scale is omitted, for the sake of clearness of illustration, but the operation of the grading mechanism will be understood from what has gone before as the action is entirely similar.

The model carriage has a pillar 422, Fig. 10, in which are mounted two small cutter heads 424, 426, with their axes at an angle of about 30 with the block spindles, and in the planes of movement of these spindles as described in the preceding machine. These cutter heads are driven by the drum 428 on the shaft 376, Fig, 10, belts 430 and 432, the latter connecting the two cutter head shafts. The model wheel 434 is similarly angled, and is about 31} inches in diameter to exactly match the cutter heads. Its axis is in the plane of movement of the model spindle. The width grading mechanism shown is of the ordinary Gilman last lathe type and need not be described.

The form of slide frame just described can be made much narrower horizontally than the one shown in the first machine. but has to be wider vertically as it has to accommodate three spindles, one above the other. The form of cutter head shown. mounted on the end of its axis, instead of in the middle of it, and with the axis angled to carry it away from the work, is peculiarly adapted to cooperate with this type of slide frame, inasmuch as the model wheel could not llU brought up to the frame between twoof the oldfashioned 10-inch cutter heads Without greatly increasing the vertical width of the frame.

Having thus described the invention, what is claimed as new and desired to be se ur by Letters Patent o the United States is 1. In a machine f the class lescribed, a slide frame. a model last holding instrumentality and two block holding instrumentalities mounted in the frame. =1 model wheel arranged to co-operate with a model held h the model holding instrumentality, single hearing block and two cutter heads having approximately the same diameter as the model last mounted in said bearing block for rotary movement with one end of each exposed. arrange to cooperate with the blocks held by the block holding iu irumeu talities in opposite senses to cut a right and left last from the blocks respectively.

2. In a machine of the class described. a

slide frame, rectilinear guides for the slide frame, two block holding and rotating instrumentalities mounted on the slide frame, two cutter heads having approximately the diameter of a mens model last and mountllll 2 .31 ii thel as n isomer with one end of each exposed and having their r es syrmnetrioally arranged relatively tea 1), ane parallel to the plane of the guides, arranged .to operate on blocks held by r eiqloqlr li ting. instrnmentalities. a model 915mg rotating means on the slide ,frame and a model 31691 for controlling the movement of the slide frame relatively to .the cutter heads.

3, ln amachine of the class described. a slidefra reetil' ear gnides upon which theslide gr ame oscillates, t vo block holding .Ilfildfltfifilglg means mounted in the slide iragne, tire ,cn tterheads having a diameter approximately that of a mens model. with their azges located in the planes in which the fl lph lfllng greens move as the slide frame s 1 es 1 :nthe guides. and inclined acutely togd lil ediigept'on of relatire feeding travel a sette a arrest fie a t r latin mea s a a he la k hal i s means and a 0 el wheel larly arranged relatively t the s respeiiai a u t ie dwith its axis an W t at i h C tt r h J a machine of the class described.

hp ding a (1 model contacting means. block treating; means. two carriages each carrying one means of each p air means for driving a carriage and a edge connecting one carriage to the other or transmitting movement from one to the nthen.

5. In a machineflofi the class described. model holding and model contacting meansv block, holding and block treating means two carriages each carrying one means of each pair, means for driving a carriage and a wedge mounted on a carriage for transmitting movement from one carriage to the other.

6. In a. machine of the class described, model holding and model contacting means. block holding and block treating moans. two carriages each carrying one means of each pair. means for driving a carriage and a. Wedge connecting them for transmitting movement from one to the other. and. constructed and arranged to alter the distance between the carriages during the last ratting.

htheir. ends nearer the work thes s, model ba d n and mounted 13 the slide frame In a machine of the class described. model holding and model contacting means. block holding and block treating means. two carriages each carrying one means of cncli pair. means for driving a carriage. and mechanism having its ends connected to the carriages respe tively and comprising a wedge arranged to transmit the drive and to alter the distance between the ends of the connecting means during the last rutting.

8. ln a machine oflhe class described. model holding and model contacting means. block holding and block treating means. two

carriages each carrying one .means of said pair. means for driving a carriage, and a connecting means for t ie carriages comprising a nudge moving transversely to the line ottrarel of the carriages to altertheir distnncc. as the cutting proceeds.

D. In a machine of the class described, l llfl llfildltllj'llng and model contacting means, l loclrl ohling andhlocl; treating means, two carriageseach carrying one means of said p oit' snemns for dr ving a carr age and connecting means for transmitting movement from one carriage to the other comprising an adinstahly angled Wedge.

lg].- In a machine of the class described. model holding and model contacting-means. block holding and block treating means, two arriages ,each carrying one means of said pair. means for drivi Ia carriage. two members, one connecte to each carriage. and a connecting means tor the mom 15 ompr sing an dius abh an. d we. go maxing transrerselvto the mem ersio alto: their distance as theicatting procee s.

11. :In 5 mach ne of the class described. l ll 91 i s n med o ting m ans.- block holding and hlocktreating .mea S;,..tWt a esses ar a e? o mean n c e} 91 1,-;-,-ct o,n$. and a. carry ng Q eanoans of each pair. a frame connect ng the carriages and comprising members having rectilinear translatory rel tionsxrith the carriages resa ieh", al members b ng a ju table lat or o 01f wren mi e cent al t rela tire movement of thecarriages.

l2. b l il l l ttilllnfi of the class described.

ma d ill li ll m. me d easte l es ea s lilocl: holding and block treating means;

two carriages each carrying one means of each pair and. arranged to move in parallel dire tions. two members having rectilinear translatory relations with the carriages respectively in a. direction transverse to the line of movement oi the carriages, but confined to the carriages as regards movement in the line of travel. said members being connected to move t gether transverse to the line of travel. the connection being adjustable as to the angle between the members wherein the rel-a ire i'novement of the car riages can be controlled 1?). In a machine of the class described. zno'lrl holding: and model conta'ting means. blo k holding and block treating means. tvo carriages each carrying], one means of each pair an"! arranged to move in parallel directions. gu des winnected t each car riagye. respectively. and arranged transverse to the d1reetion of movement. a slide in each guide. one of said guides being angul arl adjustable relatively to its carriage, the slides being fixedly conne. ted as regards relative movcincnt transverse to the said direction of carriage movemcnt, but relatively angnlarly adjustable corresponding to the angular adjustability of the said guides, and means for moving the slides upon the guides during the cutting of a last.

14. in a machine of the class described, model holding and model contacting means, block holding and block treating means, two carriages each carrying one means of each pair and arranged to move in parallel directions, a frame comprising two slide bars relatively adjustable between limits each side of parallelism, and guides connected to the carriages and engaging the slide bars respectively whereby movement may be transmitted from one carriage to the other, and uniforml modified in transmission.

15. In a machine of the class described, model holding and model contacting means, block holding and block treating means, two carriages each carrying one means of each pair and arranged to move in parallel directions, two guides connected to the carriages, a frame comprising two slide bars mounted in the guides respectively and relatively adjustable as to the angle between them. means for moving the frame whereby the guides may be caused to approach or recede from each other.

16. In a machine of the class described, model holding and model contacting means, block holding and block treating means, two carriages each carrying one means of each pair, means for driving a carriage and connectmg means extending between the carriages for transmitting the drive from one to the other, comprising a wedge through which the driving force is transmitted.

17. In a machine of the class described,

model holding and model contacting means, block holding and block treating means, two carriages, each carrying one means of each pair, means for driving a carriage, a transverse guide and a longitudinal guide on one carriage, a second transverse guide mounted on the longitudinal guide and connected to the other carriage, a slide bar in each guide, one guide being angularly adjustable to bring said slide bars into or out of parallelism, said bars being connected for simultaneous movement, and means for driving the bars in the slides whereby the distance between the carriages may be altered during the last cutting.

'18, In a machine of the class described, model holding and model contacting means, block holding and block treating means, two carriages each carrying one means of said pair, and a connection between the carriages, transmitting the drive from one to the other. said connection comprising a wedge driven transversely to the line or drive to alter the effective length of the connection.

19. In a machine of the class described, model holding and model contacting means, block holding and block treating means, two carriages each carrying one means of said pair, and a connection between the carriages, transmitting the drive from one to the other, and a wedge driven transversely to the line of drive to alter the effective length of the connection.

In testimony whereof I have signed my name to this specification.

FRANK S. BUCK. 

